The Rockies Express Pipeline (REX) announced on Monday that it expects service to commence as soon as today for the first 0.25 billion cubic feet per day (Bcf/d) of capacity on its 0.60 Bcf/d Seneca Lateral pipeline in southeast Ohio. The 14.3-mile lateral will flow gas north from the MarkWest Seneca natural gas processing plant to the REX mainline, where a newly built compressor station will allow this gas to be delivered to points west in Ohio, Indiana, and Illinois. No new pipelines will be added to the mainline; the project will allow bidirectional flows—both east and west—to occur on existing portions of the pipeline, where until now natural gas could only flow east, predominantly from western basins (see map above).